To ensure double letters are detected, try doing a little loop on the 'o' key.
为了确定双字母的情况，请在'o'键上画一个小圈。
2
Gasket system is made of double-layered, closed cellular neoprene, with stainless steel O-rings for attaching gloves.
衬垫系统由双层密闭氯丁橡胶组成，带有不锈钢O型环以附带在手套箱上。
3
Focuses on the double "o" ring connection, the scene ends meet connections, flanged connections, such as connections and their respective conditions of application and quality control points.